Electric condenser



NOV. 20, 1934. J s, WILLIAMS 1,981,533

ELECTRIC CONDENSER Filed Sept. 19, 1952 INVENTOR Y www n ATT RN EY5Patented Nov. 2i), 1934 PATENT OFFICE ELECTRIC CONDENSEI.'

Joseph Senn. Williams, Indianapolis, Ind., as-

signor to P. R. Mallory &. Co., Incorporated, Indianapolis, Ind., acorporation of Indiana Application September 19, 1931, Serial No.633,734 9 claims. (o1. 175415) This invention relates to electriccondensers or capacitors and particularly to so-called dry electrolyticcondensers or capacitors of the wound type. y I The object of theinvention generally is to provide an improved condenser of the characterindicated which is efficient, economical, readily manufactured and isadapted to provide a relatively high capacitance in a relatively smallspace.

More specifically, it is an object to provide a socalled dryelectrolytic condenser in the form of a cartridge or packet having anenvelope or casing carrying the terminals arranged so that the devicemay be readily inserted and connected for use in a large variety ofelectric appliances, for example, in radio receivers, power-packs, andthe like.

It is also an object to provide an insulating envelope or sleeve havingilaps on the end to fold over Vand completely encase the condenser,certain of the liaps being arranged to carry the terminals in a safe andeconomical manner.

It is a further object to provide an improved construction for the bodyof a wound condenser in the form of a metallic shroud which encases theparts in a safe and convenient manner.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises the features of construction,combination of elements, and arrangement of parts, which will beexemplifled in the construction hereinafter set forth and the scope ofthe application of which willbe indicated in the claims.

For a fuller understanding of the nature and objects of the invention,reference should be had to 4the following detailed description taken inconnection with the accompanying drawing, in which:

Fig` lis a perspective view of a condenser constructed in accordance`with the invention, the

flap carrying the terminals being `partially opened;

Fig. 2 is a view partly in elevation and partly in section showing theiiap which carries the terminal in open position;

Fig. 3 is a View partly in elevation and partly in section showing theconstruction of the condenser proper without its casing; and

Fig. 4 is an enlarged fragmentary view mainly in section showingtheila'p construction which carries the terminals.

Referringnow. to the drawing, 10 denotes generally the body of acondenser that is slipped into 55 an insulating envelope or casing 11,here l,indiinvention .in the form of an extended metallic cated in theform of a prismatic tube or box with iiaps at the end adapted to befolded over so as to enclose totally the body of the condenser withinthe same. The prismatic envelope here shown has four sides, so that theends may have as many as four flaps. While the lower end indicated at12in Fig. 2 may have 'four flaps, it, as well as the upper end which isdesigned to carry the terminals, preferably has but three. Thevsideflapsof the upper end, shown at 13 and 14, are designed to fold inwardly andslightly over-lap as they close the end of the casing. The back flap 15is designed to fold over the flaps 13 and 14 when folded down in place,the back flap being further extended at 16 to provide a tongue adaptedto enter the slit between the aps 13 and 14 and the side which has noflap; this tongue when so inserted engaging frictionally with the insidewall of the front side of the casing, so thatwhen in place the boxremains permanently closed. The 75 casing may be made from any suitablesheet material of an insulating character, for example a sheety of fiberimpregnated with an insulating oil or wax. The dimensions `of the casingare such that the sides arerelatively close to the body of condenser 10when disposed therein. While this condenser body is of the wound type,that is, in the form of a roll or cylindrical body comprising conductingplate electrode elements 17 and 17' separated bydielectric material 18and wound upon a central supporting column 19, it is preferred that suchcylindrical body shall undergo a certain amount of deformation toflatten the sides, whereby the interior space of the casing 11 is filledmore economically by the condenser body, reducing the clearance, whichhas no' commercial advantage, that obtains on the interior along thefourcorner edges of the casing.

105 tube of a. diameter initially suicient to permit the condenser rolljust to be slid in place. Themetallic tube here shown is of thethin-walled, colllapsible type and has a closed`- lower end 21 and maybe made from any suitable material, for ex- 11o 20 has been properlydrawn over Ithe .condenser roll, a pair of strip-like flexible terminal`electrodes22 and 22"--will project from the open end of the tube. Thesestrip-like terminal electrodes may initially be provided as extensionsyof the conducting plates or sheets, out of which the condenser roll ismade, or they may be. conducting strips that are attached tothe plateelectrode elements in any'suitable manner.' The condenser body whensuitably enshrouded is sealed in the sheath 20 by means of a filling ofinsulating-maf terial 23 that is originally plastic and soft, but whenput in place and dried or cooled becomes hard. A suitable plasticinsulating material for this purpose is that known as Parolite,

The body of the condenser 10 when in place-in the insulating casing 11preferablyrests on the lower'end 12. The upper end, however ispreferably somewhat short of the upper end of the casing 1'1. In theclearance space thus afforded between the upper en'd of the condenserbody 10 and the casing 11,.-connecting means are provided for makingelectrical connections 4between the` strip-like terminals 22 and 22''and lthose carried by the flap 15. These latter are show-n at 25 and25' and comprise rigid conducting elements preferably in the 'form of Lshaped members having perforated bases that are secured j-,by means ofrivets or eyeletsto the conducting strips 22 and 22', respectively.

In order tofmake these electrical connections within the clearance spacein the wrapper in a manner which protects the connections so that theyare not liable to be short-circuited and at the same time-are convenientto manufacture, ad-` ditional insulating ballles or strips are slippedinto this space. The rst insulating baille to be slipped into place is astrip bent intothe form of an L, as shownatf27 in Fig. 4, that isinserted behind the conducting strip 22' which .comes out from thecondenser body nearest to the centerof readily folded down in the same.This baille may press the conducting strip a little' way out toward thefront of the box, but is of a height not in excess of that of theclearance space, so that the -ap 15 may be place without .resistancefrom this baille. A

Over the top of the conducting strip 22 is slipped a second bafflemember 28' in the form of a rectangular insulating sheet that loosely tsin the top of the casing. The conducting strip 22 is now laid along theinner side ofthe flap 15, a reinforcing strip of insulating materi l 151being preferably interposed for stiffexiing purposesl A conductingwasher and eyelet :29 is then inserted and crimped into place passingvthrough the strip 22', the strip 151, the flap 15 and the perforatedbase 26 on the exterior of the flap 15. Y

Similar connections are provided for the conducting strip 22, but firstan L shaped linsulating baille 30 is inserted which is preferably largerthan the insulating baille 27, this'baille having its sides almost largeenough to llthef open end of the clearance space in the casing 11 andwhen in place and the flap 15 closed, i's no longer L shaped, but'vshaped,the two sides being inclined at-a relatively small angle. Whenthe balfle 30 has been slipped into place, the conducting strip 22 islaid carefully thereove'r and up' along`the side that projects over theflap 15. VThis is perforated at a point to one side of thatwhereconnection between the 'terminall 25 and conducting strip 22 was made,and a second conducting .electrically connected to said washer andeyelet 31 pushedv therethrough. This passes through not only theconductingv strip 22,

but also the overlying -ap of baille 30, the-strip or stiener 151, theilap 15 and the perforated base 26 of the terminal 25. It is thus seenthat 13 and 14 are bent into overlapping position4 across the top of thecasing 11, and then the flap 15 is bent downwardly and the tongue 16`inserted to make frictional contact with the front wall of the casing.Thus a box-likey condenser is provided in an insulating envelopesubstantially protecting the condenser body, while -the terminalelectrodes are in a position to be conveniently attached to electrical,conductors connecting the condensers in an electrical circuit. If forany reason it is desired to examine the condition of the condenser, .thecondenser may be detached and the ap 15 pulled open, the connectionsinspected and the condition of the interior of the box ascertained; thiswill, in generalfdisclose whether or not the condenser is in properworking order. It is also seen that by enshrouding the condenser body inthe metallic sheath 20, the condenser body is further protected. In thepreferred lform of acollapsible aluminum tube, this sheath furnishescomplete protection against access :of moisture or gases `from thesurrounding air to the condenser roll. In the event, however, that gasshould generate within the condenser roll, this can find relief t0 someextent by causing distention of the collapsible aluminum tube, and ifthat is `not suflicient, by causing the metallic sheath tofbr'eakaway'from the sealing material 23 in the end of the condenser,permitting the gas to escape Without otherwise injuring the condenser.The use of such collapsible aluminum -tubes enables these objects to beaccomplished without .materially increasing the cost over merelyencasing the condenser roll in a cardboard container.

Since certain changes may be made in the above construction anddifferent embodiments o f the invention could be made without departingfrom the scope thereof, it is intended that al1 matter contained in theabove ldescription or shown in the accompanying drawing Ashall beinterpreted as illustrative and not in a limiting sense.

. 130 Having described my invention, what I claim closing said body, andterminal connectionsy mounted on the exterior of one of said ilapsstrips on the interior of said envelope.

2. In an electrical condenser, the combination with a body provided withflexible terminal conducting strips, of a prismatic insulating envelopehaving foldable flaps at the ends for totally enclosing said body,insulating baffles inserted at one end of said envelope insuring theelectrical separationof said terminal strips, and rigid terminalconnections on the exterior of one of said ilaps electrically connectedto said strips on the interior of said envelope.

3. In an electrical condenser, the combination with a body provided withflexible terminal conducting strips, of a prismatic insulating envelopehaving foldable flaps at the ends for totally enclosing said body,insulating bailies inserted at one end of said envelope insuring theelectrical separation of said terminal strips, rigid conducting membershaving perforated bases disposed in spaced relation on the exterior of aflap at one end, and conducting securing means passing through said'perforated bases and making electrical contact individually with saidterminal strips on the interior side of said flap.

4. In an electrical condenser, the combination with a condenser bodyprovided with' terminals, of a metallic sheath for said body in the formof a tube'closed at the bottom and dimensioned to fit snugly about thesides, hardened plastic insulating material about said terminals sealingsaid body in the open end of said sheath, a prismatic envelope havingfoldable flaps at the ends for totally enclosing said sheathed body, andrigid terminals on the exterior of one flap at one end electricallyconnected to said terminals on the interior of said envelope.

5. In an electrical condenser, the combination with a condenser bodyprovided with terminals, of a metallic sheath for saidvbody in the formof a tube closed at the bottom and dimensioned to lit snugly about thesides, hardened plastic insulating material about said terminals sealingsaid body in the open end of said sheath, a pris-v matic envelope havingfoldable flaps atthe ends totally enclosing said sheathed body and of alength adapted to provide a narrow clearance at the terminal end of saidbody, insulating baf-- fies inserted in said space arranged to insureelectrical separation of said terminals, and rigid terminals on theexterior of one flap at one end.

electrically connected to the rst said terminals on the interior of saidenvelope.

6. In an electrical condenser, the combination with a condenser bodyprovided withterminals, of a metallic sheath for said body in the formof a tube closed at the bottom and dimensioned to t snugly about thesides, hardened plastic insulating material about said terminals sealingsaid body in the open end of said sheath, a prismatic envelope havingfoldable flaps at the ends totally enclosing said sheathed body and of alength adapted to provide a narrow clearance at the terminal end of saidbody, insulating baffies inserted in said space arranged to insureelectrical separation of said terminals, a stifiening strip on theoutermost flap at the clearance l end of said envelope, said terminalsbeing led out to lie over said stiffening strip and having a portion ofone insulating baille extending therebetween, rigid conducting L shapedmembers having perforated bases disposed on the ex- A terior of saidoutermost flap, and conducting securing means passing through saidperforated bases and said terminal extensions overlying said stiffeningstrip whereby the terminals on the exterior of said flap makeelectrical. contact with those on the interior of said envelope.

7. In'an electrical condenser, the combination with a condenser 'bodyprovided with flexible terminalv conductors, o f a prismatic insulatingenvelope having foldable flaps at the ends for enclosing said body, andsubstantially rigid terminal connections mounted on the exterior of oneof said flaps electrically connected to said conductors to provide saidenclosed condenser body with external terminals.

8. In an electrical condenser, the combination of an fencased condenserbody provided With flexible terminal conductors extending from the case,a prismatic insulating envelope having foldable flaps at the ends 'forenclosing said encased body, and vsubstantially rigid terminalconnections mounted on the exterior of one of said ilaps electricallyconnected to said conductors to provide said enclosed and encasedcondenser body with external terminals.

9. In an electrical condenser, the combination of a condenser body`sealed within a case provided With flexible terminal conductorsextending from said case, a prismatic insulating .envelopehaving-foldable flaps at the ends for enclosing said encased body, andsubstantially rigid terminal connections mounted on the vexterior of oneof said flaps electrically connected to said conductors to provide saidenclosed and encased condenser body with external terminals.

' JOSEPH SENN WILLIAMS.

